CR6202 Просмотр технического описания (PDF) - Unspecified

Номер в каталоге

Компоненты Описание

производитель

CR6202

Switching Power Supply Controller ICs

Unspecified 

CR6202

improved). In the open or closed cycle, if power transistor is detected to exceed upper limit current, the

upper limit current trigger will set firstly and forces FB to pull down, duty cycle reduced, so to protect

power transistor and transformer. In the next closed cycle start-up time, or when FB is less than 1.8V,

upper current trigger resets. In addition, CR6202 is built in thermal protection, when the internal

temperature is above 125℃, it will widen the cycle of oscillator, so that the temperature of CR6202 will

not exceed 135℃. Slop compensation is built in to stabilization open/closed cycle during the maximum

duty cycle or the continual current mode of CR6202.

If VCC reduces to 4.4V, oscillator is turn off, OSC1 OSC2 low level, power supply keeps closed cycle.

when VCC continually reduces to about 3.6 V , CR6202 enters start-up phase again.

Fig.1 OPEN/CLOSED CYCLE WAVES IN NORMAL OPERATION

Electrical parameter definition

Start-up accept current: OC node current when OB has a 0.1mA pull-down current in start-up phase.

Start-up static current: VCC connects to filter capacitor and adjustable current source, CT connects to

330PF，other pins are floating. It is the minimum current that could oscillate the VCC.

Start-up voltage: The max. value of VCC oscillation above.

Restart voltage: The min. value of VCC oscillation above.

Voltage of Oscillator is turn off: VCC value, which stops the oscillator in falling time of VCC oscillation

above.

Static current: In normal operation, FB connects to the grand through 1K resistor. VCC power supply

current.

The pull-up/ pull-down current of oscillator: In normal operation, FB=2.5V,CT=1.25V, pull-up

/pull-down current on CT.

Jun.2008 V1.2

4/7

Share Link: